Croatia’s Constitutional Court thwarted President Zoran Milanović’s plan to run for a parliament seat, ruling he must first resign as president since partisan political activities are incompatible with this office, the court declared on Monday. Milanović announced plans on Friday to run on the list of the opposition Social Democrats (SDP) in the early parliamentary elections scheduled for April 17. In case the opposition emerged victorious from the vote, he was planning to become prime minister and resign as president, Milanović said, citing the controversial justice policies of Prime Minister…